mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 01:16:42 +07:00
e2619cf78e
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
379 lines
8.0 KiB
C
379 lines
8.0 KiB
C
/*
|
|
* linux/drivers/input/serio/sa1111ps2.c
|
|
*
|
|
* Copyright (C) 2002 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/input.h>
|
|
#include <linux/serio.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/hardware/sa1111.h>
|
|
|
|
#define PS2CR 0x0000
|
|
#define PS2STAT 0x0004
|
|
#define PS2DATA 0x0008
|
|
#define PS2CLKDIV 0x000c
|
|
#define PS2PRECNT 0x0010
|
|
|
|
#define PS2CR_ENA 0x08
|
|
#define PS2CR_FKD 0x02
|
|
#define PS2CR_FKC 0x01
|
|
|
|
#define PS2STAT_STP 0x0100
|
|
#define PS2STAT_TXE 0x0080
|
|
#define PS2STAT_TXB 0x0040
|
|
#define PS2STAT_RXF 0x0020
|
|
#define PS2STAT_RXB 0x0010
|
|
#define PS2STAT_ENA 0x0008
|
|
#define PS2STAT_RXP 0x0004
|
|
#define PS2STAT_KBD 0x0002
|
|
#define PS2STAT_KBC 0x0001
|
|
|
|
struct ps2if {
|
|
struct serio *io;
|
|
struct sa1111_dev *dev;
|
|
void __iomem *base;
|
|
unsigned int open;
|
|
spinlock_t lock;
|
|
unsigned int head;
|
|
unsigned int tail;
|
|
unsigned char buf[4];
|
|
};
|
|
|
|
/*
|
|
* Read all bytes waiting in the PS2 port. There should be
|
|
* at the most one, but we loop for safety. If there was a
|
|
* framing error, we have to manually clear the status.
|
|
*/
|
|
static irqreturn_t ps2_rxint(int irq, void *dev_id)
|
|
{
|
|
struct ps2if *ps2if = dev_id;
|
|
unsigned int scancode, flag, status;
|
|
|
|
status = sa1111_readl(ps2if->base + PS2STAT);
|
|
while (status & PS2STAT_RXF) {
|
|
if (status & PS2STAT_STP)
|
|
sa1111_writel(PS2STAT_STP, ps2if->base + PS2STAT);
|
|
|
|
flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
|
|
(status & PS2STAT_RXP ? 0 : SERIO_PARITY);
|
|
|
|
scancode = sa1111_readl(ps2if->base + PS2DATA) & 0xff;
|
|
|
|
if (hweight8(scancode) & 1)
|
|
flag ^= SERIO_PARITY;
|
|
|
|
serio_interrupt(ps2if->io, scancode, flag);
|
|
|
|
status = sa1111_readl(ps2if->base + PS2STAT);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Completion of ps2 write
|
|
*/
|
|
static irqreturn_t ps2_txint(int irq, void *dev_id)
|
|
{
|
|
struct ps2if *ps2if = dev_id;
|
|
unsigned int status;
|
|
|
|
spin_lock(&ps2if->lock);
|
|
status = sa1111_readl(ps2if->base + PS2STAT);
|
|
if (ps2if->head == ps2if->tail) {
|
|
disable_irq_nosync(irq);
|
|
/* done */
|
|
} else if (status & PS2STAT_TXE) {
|
|
sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
|
|
ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
|
|
}
|
|
spin_unlock(&ps2if->lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Write a byte to the PS2 port. We have to wait for the
|
|
* port to indicate that the transmitter is empty.
|
|
*/
|
|
static int ps2_write(struct serio *io, unsigned char val)
|
|
{
|
|
struct ps2if *ps2if = io->port_data;
|
|
unsigned long flags;
|
|
unsigned int head;
|
|
|
|
spin_lock_irqsave(&ps2if->lock, flags);
|
|
|
|
/*
|
|
* If the TX register is empty, we can go straight out.
|
|
*/
|
|
if (sa1111_readl(ps2if->base + PS2STAT) & PS2STAT_TXE) {
|
|
sa1111_writel(val, ps2if->base + PS2DATA);
|
|
} else {
|
|
if (ps2if->head == ps2if->tail)
|
|
enable_irq(ps2if->dev->irq[1]);
|
|
head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
|
|
if (head != ps2if->tail) {
|
|
ps2if->buf[ps2if->head] = val;
|
|
ps2if->head = head;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ps2if->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int ps2_open(struct serio *io)
|
|
{
|
|
struct ps2if *ps2if = io->port_data;
|
|
int ret;
|
|
|
|
ret = sa1111_enable_device(ps2if->dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
|
|
SA1111_DRIVER_NAME(ps2if->dev), ps2if);
|
|
if (ret) {
|
|
printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
|
|
ps2if->dev->irq[0], ret);
|
|
sa1111_disable_device(ps2if->dev);
|
|
return ret;
|
|
}
|
|
|
|
ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
|
|
SA1111_DRIVER_NAME(ps2if->dev), ps2if);
|
|
if (ret) {
|
|
printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
|
|
ps2if->dev->irq[1], ret);
|
|
free_irq(ps2if->dev->irq[0], ps2if);
|
|
sa1111_disable_device(ps2if->dev);
|
|
return ret;
|
|
}
|
|
|
|
ps2if->open = 1;
|
|
|
|
enable_irq_wake(ps2if->dev->irq[0]);
|
|
|
|
sa1111_writel(PS2CR_ENA, ps2if->base + PS2CR);
|
|
return 0;
|
|
}
|
|
|
|
static void ps2_close(struct serio *io)
|
|
{
|
|
struct ps2if *ps2if = io->port_data;
|
|
|
|
sa1111_writel(0, ps2if->base + PS2CR);
|
|
|
|
disable_irq_wake(ps2if->dev->irq[0]);
|
|
|
|
ps2if->open = 0;
|
|
|
|
free_irq(ps2if->dev->irq[1], ps2if);
|
|
free_irq(ps2if->dev->irq[0], ps2if);
|
|
|
|
sa1111_disable_device(ps2if->dev);
|
|
}
|
|
|
|
/*
|
|
* Clear the input buffer.
|
|
*/
|
|
static void ps2_clear_input(struct ps2if *ps2if)
|
|
{
|
|
int maxread = 100;
|
|
|
|
while (maxread--) {
|
|
if ((sa1111_readl(ps2if->base + PS2DATA) & 0xff) == 0xff)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static unsigned int ps2_test_one(struct ps2if *ps2if,
|
|
unsigned int mask)
|
|
{
|
|
unsigned int val;
|
|
|
|
sa1111_writel(PS2CR_ENA | mask, ps2if->base + PS2CR);
|
|
|
|
udelay(2);
|
|
|
|
val = sa1111_readl(ps2if->base + PS2STAT);
|
|
return val & (PS2STAT_KBC | PS2STAT_KBD);
|
|
}
|
|
|
|
/*
|
|
* Test the keyboard interface. We basically check to make sure that
|
|
* we can drive each line to the keyboard independently of each other.
|
|
*/
|
|
static int ps2_test(struct ps2if *ps2if)
|
|
{
|
|
unsigned int stat;
|
|
int ret = 0;
|
|
|
|
stat = ps2_test_one(ps2if, PS2CR_FKC);
|
|
if (stat != PS2STAT_KBD) {
|
|
printk("PS/2 interface test failed[1]: %02x\n", stat);
|
|
ret = -ENODEV;
|
|
}
|
|
|
|
stat = ps2_test_one(ps2if, 0);
|
|
if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
|
|
printk("PS/2 interface test failed[2]: %02x\n", stat);
|
|
ret = -ENODEV;
|
|
}
|
|
|
|
stat = ps2_test_one(ps2if, PS2CR_FKD);
|
|
if (stat != PS2STAT_KBC) {
|
|
printk("PS/2 interface test failed[3]: %02x\n", stat);
|
|
ret = -ENODEV;
|
|
}
|
|
|
|
sa1111_writel(0, ps2if->base + PS2CR);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Add one device to this driver.
|
|
*/
|
|
static int ps2_probe(struct sa1111_dev *dev)
|
|
{
|
|
struct ps2if *ps2if;
|
|
struct serio *serio;
|
|
int ret;
|
|
|
|
ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
|
|
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
|
|
if (!ps2if || !serio) {
|
|
ret = -ENOMEM;
|
|
goto free;
|
|
}
|
|
|
|
|
|
serio->id.type = SERIO_8042;
|
|
serio->write = ps2_write;
|
|
serio->open = ps2_open;
|
|
serio->close = ps2_close;
|
|
strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
|
|
strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
|
|
serio->port_data = ps2if;
|
|
serio->dev.parent = &dev->dev;
|
|
ps2if->io = serio;
|
|
ps2if->dev = dev;
|
|
sa1111_set_drvdata(dev, ps2if);
|
|
|
|
spin_lock_init(&ps2if->lock);
|
|
|
|
/*
|
|
* Request the physical region for this PS2 port.
|
|
*/
|
|
if (!request_mem_region(dev->res.start,
|
|
dev->res.end - dev->res.start + 1,
|
|
SA1111_DRIVER_NAME(dev))) {
|
|
ret = -EBUSY;
|
|
goto free;
|
|
}
|
|
|
|
/*
|
|
* Our parent device has already mapped the region.
|
|
*/
|
|
ps2if->base = dev->mapbase;
|
|
|
|
sa1111_enable_device(ps2if->dev);
|
|
|
|
/* Incoming clock is 8MHz */
|
|
sa1111_writel(0, ps2if->base + PS2CLKDIV);
|
|
sa1111_writel(127, ps2if->base + PS2PRECNT);
|
|
|
|
/*
|
|
* Flush any pending input.
|
|
*/
|
|
ps2_clear_input(ps2if);
|
|
|
|
/*
|
|
* Test the keyboard interface.
|
|
*/
|
|
ret = ps2_test(ps2if);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* Flush any pending input.
|
|
*/
|
|
ps2_clear_input(ps2if);
|
|
|
|
sa1111_disable_device(ps2if->dev);
|
|
serio_register_port(ps2if->io);
|
|
return 0;
|
|
|
|
out:
|
|
sa1111_disable_device(ps2if->dev);
|
|
release_mem_region(dev->res.start, resource_size(&dev->res));
|
|
free:
|
|
sa1111_set_drvdata(dev, NULL);
|
|
kfree(ps2if);
|
|
kfree(serio);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Remove one device from this driver.
|
|
*/
|
|
static int ps2_remove(struct sa1111_dev *dev)
|
|
{
|
|
struct ps2if *ps2if = sa1111_get_drvdata(dev);
|
|
|
|
serio_unregister_port(ps2if->io);
|
|
release_mem_region(dev->res.start, resource_size(&dev->res));
|
|
sa1111_set_drvdata(dev, NULL);
|
|
|
|
kfree(ps2if);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Our device driver structure
|
|
*/
|
|
static struct sa1111_driver ps2_driver = {
|
|
.drv = {
|
|
.name = "sa1111-ps2",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.devid = SA1111_DEVID_PS2,
|
|
.probe = ps2_probe,
|
|
.remove = ps2_remove,
|
|
};
|
|
|
|
static int __init ps2_init(void)
|
|
{
|
|
return sa1111_driver_register(&ps2_driver);
|
|
}
|
|
|
|
static void __exit ps2_exit(void)
|
|
{
|
|
sa1111_driver_unregister(&ps2_driver);
|
|
}
|
|
|
|
module_init(ps2_init);
|
|
module_exit(ps2_exit);
|
|
|
|
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
|
|
MODULE_DESCRIPTION("SA1111 PS2 controller driver");
|
|
MODULE_LICENSE("GPL");
|